Fracture delineation and monitoring of geothermal and coal seam gas areas using magnetotellurics

Stephan Thiel; Jared Peacock; Graham Heinson; Michael Hatch; Peter Reid

doi:10.1071/ASEG2012ab411

ISSN: 2202-0586
E-ISSN:

oa Fracture delineation and monitoring of geothermal and coal seam gas areas using magnetotellurics
Authors Stephan Thiel^a,c, Jared Peacock^a,d, Graham Heinson^a,e, Michael Hatch^a,f and Peter Reid^b,g
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^a University of Adelaide, DP313 Mawson Building, Adelaide, , SA 5019 ^b Petratherm Ltd, 129 Greenhill Rd, Unley, SA 5061 ^c [email protected] ^d [email protected] ^e [email protected] ^f [email protected] ^g [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2012ab411
- Published online: 01 Dec 2012

Abstract

Summary

New ways of energy production through the use of coal seam gas plays and geothermal hot dry rock and hot sedimentary aquifer systems pose challenges in identifying and monitoring fluid in the subsurface. We propose the use of the magnetotelluric (MT) method to image static and dynamic fluid distributions in the subsurface exhausting the contrast in electrical conductivity between resistive host rock and conductive fluid-filled, porous rock. Base line MT measurements provide reference transfer functions and inverse models to characterise the electrical conductivity distribute on which is linked with bore hole and other geophysical data to obtain knowledge about fluid distribution at depth. The reference models are used to accurately forward model fluid injection or extraction temporally and spatially. This work shows results from fluid injections at a hot dry rock system at Paralana, South Australia, and its applicability to other geothermal and coal seam gas systems.

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References

Archie, G. The electrical resistivity log as an aid in determining some reservoir characteristics. Trans. A.I.M.E., 1942, 146, 54-62
Cagniard, L., Basic theory of the magneto-telluric method of geophysical prospecting, Geophysics, SEG, 1953, 18, 605-635
deGroot Hedlin, C. & Constable, S., Occam’s inversion to generate smooth, two-dimensional models from magnetotelluric data, Geophysics, SEG, 1990, 55, 1613-1624
Mackie, R. L.; Madden, T. & Wannamaker, P., Threedimensional magnetotelluric modeling using difference equations—Theory and comparisons to integral equation solutions, Geophysics, SEG, 1993, 58, 215-226
Nesbitt, B. Electrical resistivities of crustal fluids. Journal of Geophysical Research, 1993, 98, 4301-4310
Nover, G. Electrical Properties of Crustal and Mantle Rocks: A Review of Laboratory Measurements and their Explanation, Surveys in Geophysics, 2005, 26, 593-651
House, L. S., Locating microearthquakes induced by hydraulic fracturing in crystalline rock, Geophysical Research Letters, 1987, 14, 919-92
Phillips, W. S.; Rutledge, J. T.; House, L. S. & Fehler, M. C., Induced microearthquake patterns in hydrocarbon and geothermal reservoirs: six case studies, Pure and Applied Geophysics, Seismic Research Center, Los Alamos National Laboratory, 2002, 159, 345-369

/content/journals/10.1071/ASEG2012ab411

Article Type: Research Article

Keyword(s): coal seam gas; geothermal; magnetotellurics; modelling

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